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Question

A certain organic substance used as a solvent in many reactions contains carbon, hydrogen, oxygen and sulphur. Weight % of hydrogen in the compound is 7.7. The weight ratio C : O : S = 3 : 2 : 4. What is the least possible molar mass (in g) of the compound ?

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Solution

Let us suppose that the mass of the compound is 100 g
Mass % of H=7.7
Mass % of C=30.74
Mass % of O=20.52
Mass % of S=41.04
least possible molar mass of the compound is the empirical molar mass
empirical formula=C2H6OS
=2(c)+6(H)+(O)+S=24+6+16+32=78 g

970143_1044401_ans_e479e4d6624f482a883370ff6dc41ce1.PNG

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